Hey, it's Empire's Book of the Day. I'm Andrew Limbaugh. All right, I've heard of face blindness before,

but I don't know if I really understood it until today's interview. It's with journalist Sadie Dingfelder,

who, yes, has face blindness, and she's got a new book looking into some of the research behind it,

called Do I Know You?

And in this interview with Empires Aisha Rusco, they started talking about how we really don't know how other people perceive the world.

I mean, there's a part early on where Zadie talks about not being able to picture anything in her head, but she also didn't realize that this was a thing other people could do.

Anyway, they guys talking about all of that, the moral question of getting a diagnosis,

and some interesting facts about monkeys and butts.

That's after the break.

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Distant wars, murky conflicts, diplomacy behind closed doors.

On our new show, Sources and Methods.

NPR reporters on the ground bring you stories of real people helping you understand why distant events matter here at home.

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One day, Sadie Dingfelder had an epiphany in the grocery store.

She spotted her husband with a jar of store brand peanut butter.

That hypocrite had just been extolling the virtues of homemade nutbutters,

so she plucked it out of his hands. Only that wasn't her husband. How did Sadie Dean

Felder mistake a stranger for her husband? And why? To find out the freelance science

journalist took a deep dive into her own brain. Her book is

Do I Know You? And Sadie Dingfelder joins us now. Welcome to the show. Thanks for having me.

Before we get into the science of your brain, you always kind of knew that you were a bit quirky. Can you explain what it's

...